Datasheet

HUSB238A

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Page 15 of 22

UNDER VOLTAGE PROTECTION

The HUSB238A detects the VBUS pin voltage to achieve a disconnection detection. When the under voltage fault

occurs, the HUSB238A moves out the Attached.SNK state.

Please note that this disconnection detection is only valid when the requested VBUS voltage is higher than 5 V. when

the request voltage is equal to 5 V (FPDO=5V, QC2, BC1.2 and Divider 3), the disconnection threshold is vVBPRS_F. If

the request RDO is APDO, the UV detection is ignored. Refer to the Table 14.

Table 14. Under-voltage Threshold in Sink Mode

Requested Voltage (V)

Under-voltage Threshold

5 V

vVBPRS_F

5 V to 10 V

80% of Requested Voltage

10 V to 26 V

86% of Requested Voltage

Higher than 26 V

22.4 V

THREMAL SHUT DOWN

The HUSB238A integrates thermal shut down function. It monitors the internal junction temperature. When the junction

temperature reaches the thermal shut down threshold TTSD_R for tTSW, and the current requested voltage is higher than

5 V, the HUSB238A requests 5V voltage directly, regardless of the previous established contract, to reduce the total

system power. If the junction temperature reaches the thermal shut down threshold TTSD_R for tTSD, the TSD fault can be

set to entry the fault mode. If the fault is removed, the device enters into unattached mode after 50ms.

I2C MODE

After the initialization, the HUSB238A is able to output the status of current connection. When ADDR/ORIENT is

connected to VDD or GND during initialization, HUSB238A is in I2C mode. In this mode, the INT_N, SDA/SNK_VSET,

SCL/SNK_ISET pins are repopulated as I2C interface pins.

INT_N

The INT_N pin is an active LOW open drain interruption output used to prompt the processor to access the I2C registers.

An external pull-up resistor is recommended for INT_N pin to output a high voltage level when this pin is not active. The

pull-up voltage should be same as the pull-up voltage of SCL and SDA.

SCL AND SDA

The HUSB238A implements a Fast-mode I2C interface. The SCL and SDA pins can detect the status of the input signals

and drive the I2C bus when needed.

DEAD BATTERY

The HUSB238A works as PD sink role which requires Rd resistor to be presented on the CC pins even in the un-

powered state for successful Type-C detection by source adapter.

The dead battery function supports default USB, 1.5 A and 3.0 A source broadcast Rp current.

SLEEP MODE

The HUSB238A has a specified Sleep Mode to save the power consumption from VDD or VBUS. This function can be

enabled or disabled by internal fuse option.